diff --git a/ProcessLib/LiquidFlow/LiquidFlowLocalAssembler-impl.h b/ProcessLib/LiquidFlow/LiquidFlowLocalAssembler-impl.h
index 0ecec827009b6ac09c990dba906e173afe5c58f4..6b166a5489b76a3bb64770b2ec357eba924229bb 100644
--- a/ProcessLib/LiquidFlow/LiquidFlowLocalAssembler-impl.h
+++ b/ProcessLib/LiquidFlow/LiquidFlowLocalAssembler-impl.h
@@ -177,6 +177,10 @@ LiquidFlowLocalAssembler<ShapeFunction, IntegrationMethod, GlobalDim>::
         std::vector<NumLib::LocalToGlobalIndexMap const*> const& dof_table,
         std::vector<double>& velocity_cache) const
 {
+    // TODO (tf) Temporary value not used by current material models. Need
+    // extension of secondary variable interface.
+    double const dt = std::numeric_limits<double>::quiet_NaN();
+
     constexpr int process_id = 0;
     auto const indices =
         NumLib::getIndices(_element.getID(), *dof_table[process_id]);